| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| /*! |
| * \file src/relay/analysis/dependency_graph.h |
| * \brief create a dependency graph. |
| */ |
| #ifndef TVM_RELAY_ANALYSIS_DEPENDENCY_GRAPH_H_ |
| #define TVM_RELAY_ANALYSIS_DEPENDENCY_GRAPH_H_ |
| |
| #include <tvm/relay/expr.h> |
| |
| #include <unordered_map> |
| #include <vector> |
| |
| #include "../../support/arena.h" |
| #include "../transforms/let_list.h" |
| |
| namespace tvm { |
| namespace relay { |
| |
| using support::LinkedList; |
| using support::LinkNode; |
| |
| /* DependencyGraph track input and output of an Expr. |
| * Additionally, dummy scope is created to model scope. |
| * It allow us to traverse the graph in reverse order. |
| */ |
| class DependencyGraph { |
| public: |
| /*! \brief A node in the graph. */ |
| struct Node { |
| // Determine scope boundaries. Used for calculating scopes, not for |
| // constructing dependency graph. |
| bool new_scope = false; |
| // incoming edges |
| LinkedList<Node*> children; |
| // outgoing edges |
| LinkedList<Node*> parents; |
| }; |
| |
| /*! \brief Maps a Relay Expr to its node in the dependency graph. */ |
| std::unordered_map<Expr, Node*, ObjectPtrHash, ObjectPtrEqual> expr_node; |
| |
| /*! \brief The dependency graph in post DFS order. */ |
| std::vector<Node*> post_dfs_order; |
| |
| /*! |
| * \brief Create a dependency graph. |
| * \param arena The arena used for data allocation. |
| * \param body The body of the expression to create a graph. |
| */ |
| static DependencyGraph Create(support::Arena* arena, const Expr& body); |
| |
| private: |
| class Creator; |
| }; |
| |
| } // namespace relay |
| } // namespace tvm |
| #endif // TVM_RELAY_ANALYSIS_DEPENDENCY_GRAPH_H_ |